On the coast, in the rock, a dark and mysterious cave opens up. How deep can it ever be? Will it be empty, or will it hide something inside?
Maybe a pirate's treasure, or someone's refuge.
The coast is full of secrets and mysteries.
The sky, of course, with this stormy atmosphere and dimmed sunlight, doesn't bode well.
Excellent image both as a cover and as a background, it could be accompanied by a more or less peaceful scene, of exploration, or to an important one according to the needs.